Cory, That is only for calculations using a fluid delivery time calculation software. As Ron said when doing an IT it is always the smallest orifice used to ensure a trip. These are two totally different issues. FYI.
Rod DiBona Rapid Fire -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Cory Power Sent: Tuesday, October 04, 2011 4:13 PM To: [email protected] Subject: Re: Equiv Orifice for OH Inspectors Test NFPA 13 Table 7.2.3.6.1 Dry Pipe System Water Delivery States Ordinary Hazard group 1 to have 2 most remote sprinklers initially open with 50 second water delivery time -- Cory Power P& P Sprinklers Ltd 6 Main Rd Chapel Arm, NL A0B 1L0 Ph: (709) 592-2029 Fax: (709) 592-2019 On 10/4/2011 7:38 PM, Ron Greenman wrote: > I'm afraid you always use the single smallest orifice in the system as you > IT test orifice and one only, no matter the hazard. The objective is to > insure that trip time or alarm initiation occurs within the allotted time > if only one head of the smallest orifice type in the system is flowing. > > On Tue, Oct 4, 2011 at 2:57 PM, Cory Power<[email protected]> wrote: > >> Doesn't Ordinary Hazard require two flowing heads? >> >> >> -- >> Cory Power >> P& P Sprinklers Ltd >> 6 Main Rd >> Chapel Arm, NL A0B 1L0 >> Ph: (709) 592-2029 >> Fax: (709) 592-2019 >> >> >> On 10/4/2011 7:24 PM, Ron Greenman wrote: >> >>> This may be a dumb question but if it's a system with 5.6K heads as the >>> smallest orifice then it needs to alarm (AV) with one head flowing or trip >>> (DPV) with one head flowing. Why would you have two heads for the IT? >>> >>> On Tue, Oct 4, 2011 at 2:48 PM, Cory Power<[email protected]> wrote: >>> >>> The reason I'm asking is because it is an ordinary hazard system and in >>>> the plans they spec the inspectors test routing to a hub drain in a >>>> janitors >>>> closet. It would be much easier to have one 11.2k orifice above the hub >>>> drain than two 5.6 k's. >>>> >>>> >>>> -- >>>> Cory Power >>>> P& P Sprinklers Ltd >>>> 6 Main Rd >>>> Chapel Arm, NL A0B 1L0 >>>> Ph: (709) 592-2029 >>>> Fax: (709) 592-2019 >>>> >>>> >>>> On 10/4/2011 6:07 PM, Justin Reid wrote: >>>> >>>> The Q=k*sqrt(p) math says that it should be equal flow with equal >>>>> pressure. >>>>> I guess you would have slightly less pressure with the 11.2 since there >>>>> is >>>>> more flow(friction). >>>>> >>>>> I just had an issue yesterday trying to get a flow valve to trip with a >>>>> remote test (one head) and thought the same thing (to look at using two >>>>> heads). >>>>> >>>>> Good luck, >>>>> >>>>> Justin Reid >>>>> >>>>> >>>>> >>>>> >>>>> On Tue, Oct 4, 2011 at 1:13 PM, Cory Power<[email protected]> >>>>> wrote: >>>>> >>>>> Just wondering if anyone have used an 11.2 K Orifice to substitute for >>>>> >>>>>> two >>>>>> 5.6 k heads on an OH1 Dry Inspectors test? Shouldn't it be equivalent? >>>>>> >>>>>> -- >>>>>> Cory Power >>>>>> P& P Sprinklers Ltd >>>>>> 6 Main Rd >>>>>> Chapel Arm, NL A0B 1L0 >>>>>> Ph: (709) 592-2029 >>>>>> Fax: (709) 592-2019 >>>>>> >>>>>> -------------- next part -------------- >>>>>> An HTML attachment was scrubbed... >>>>>> URL:<http://fireball.****firespr**inkler.org/mailman/****< >>>>>> http://firesprinkler.org/**mailman/**<http://firesprinkler.org/mailman/**> >>>>>> private/sprinklerforum/******attachments/20111004/c48f4ae4/**** >>>>>> **attachment.html<http://**fir**eball.firesprinkler.org/**** >>>>>> mailman/private/<http://fireball.firesprinkler.org/**mailman/private/> >>>>>> **sprinklerforum/attachments/****20111004/c48f4ae4/attachment.** >>>>>> **html<http://fireball.**firesprinkler.org/mailman/** >>>>>> private/sprinklerforum/**attachments/20111004/c48f4ae4/** >>>>>> attachment.html<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/c48f4ae4/attachment.html> >>>>>> ______________________________******_________________ >>>>>> Sprinklerforum mailing list >>>>>> Sprinklerforum@firesprinkler.******org<Sprinklerforum@** >>>>>> firesprinkler.** >>>>>> org<Sprinklerforum@**firesprinkler.org<[email protected]> >>>>>> http://fireball.firesprinkler.******org/mailman/listinfo/**** >>>>>> sprinklerforum<http://**fireba**ll.firesprinkler.org/**** >>>>>> mailman/listinfo/**<http://fireball.firesprinkler.org/**mailman/listinfo/**> >>>>>> >>>>>> sprinklerforum<http://**fireball.firesprinkler.org/**mailman/listinfo/ >>>>>> **sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> >>>>>> -------------- next part -------------- >>>>>> >>>>> An HTML attachment was scrubbed... >>>>> URL:<http://fireball.**firespr**inkler.org/mailman/**<http://firesprinkler.org/mailman/**> >>>>> private/sprinklerforum/****attachments/20111004/53f36606/** >>>>> **attachment.html<http://**fireball.firesprinkler.org/** >>>>> mailman/private/**sprinklerforum/attachments/** >>>>> 20111004/53f36606/attachment.**html<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/53f36606/attachment.html> >>>>> ______________________________****_________________ >>>>> Sprinklerforum mailing list >>>>> Sprinklerforum@firesprinkler.****org<Sprinklerforum@**firesprinkler.org<[email protected]> >>>>> http://fireball.firesprinkler.****org/mailman/listinfo/**** >>>>> sprinklerforum<http://**fireball.firesprinkler.org/**mailman/listinfo/* >>>>> *sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> >>>>> -------------- next part -------------- >>>> An HTML attachment was scrubbed... >>>> URL:<http://fireball.**firespr**inkler.org/mailman/**<http://firesprinkler.org/mailman/**> >>>> private/sprinklerforum/****attachments/20111004/655dd34b/** >>>> **attachment.html<http://**fireball.firesprinkler.org/**mailman/private/ >>>> **sprinklerforum/attachments/**20111004/655dd34b/attachment.**html<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/655dd34b/attachment.html> >>>> ______________________________****_________________ >>>> Sprinklerforum mailing list >>>> Sprinklerforum@firesprinkler.****org<Sprinklerforum@**firesprinkler.org<[email protected]> >>>> http://fireball.firesprinkler.****org/mailman/listinfo/**** >>>> sprinklerforum<http://**fireball.firesprinkler.org/**mailman/listinfo/** >>>> sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> >>>> >>> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL:<http://fireball.**firesprinkler.org/mailman/** >> private/sprinklerforum/**attachments/20111004/58b8f241/**attachment.html<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/58b8f241/attachment.html> >> ______________________________**_________________ >> Sprinklerforum mailing list >> Sprinklerforum@firesprinkler.**org<[email protected]> >> http://fireball.firesprinkler.**org/mailman/listinfo/**sprinklerforum<http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> >> > > -------------- next part -------------- An HTML attachment was scrubbed... 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